By Zhiwen Ma, Ahmad Pesaran, Vahan Gevorgian, Don Gwinner, and William Kramer Energy Storage, Renewable Power Generation, and the Grid NREL capabilities help to develop and test energy-storage technologies. ONTINUED GROWTH OF RENEWable power generation could lead to a sustainable energy future with lower greenhouse gas emissions. A recent trend highlighting this growth is the installation of solar and wind power generation exceeding that of new conventional power generation from coal and nuclear power plants. Furthermore, C Digital Object Identifier 10.1109/MELE.2015.2447972 Date of publication: 1 September 2015 30 I E E E E l e c t r i f i cati o n M agaz ine / SEPTEMBER 2015 2325-5987/15©2015IEEE